The migration of Be in monocrystalline samples was studied, at temperatures of between 583 and 800K, by using sputter-sectioning and secondary ion mass spectroscopy techniques. It was found that the diffusivity (table 76) obeyed an Arrhenius-type equation. The results could be described in terms of an electrostatic model for impurity diffusion in noble metals, assuming that the Be behaved like a divalent metal. A slight curvature of the Arrhenius plot was attributed to a contribution which was made by divacancies.

A.Almazouzi, M.P.Macht, V.Naundorf, G.Neumann: Physica Status Solidi A, 1992, 133[2], 305-15